hi guys.just got into photography recently, and have signed up for a few courses..I have read about F stop numbers with regards to Aperture , Shutter Speed and ISO and am trying to understand it.To my understanding, an example of full stops would be as follows
Aperture 2, 2.8, 4, 5.6, 8, 11, 16, 22
( Bigger Aperture to Smaller Aperture , Cutting by Half, amount of light with each stop) (low DOP to high DOP)
Shutter Speed 1/15 , 1/30 , 1/60 , 1/125 , 1/250 , 1/500
( Slower Shutter Speed to Faster Shutter Speed , Cutting by Half , amount of time Shutter is open with each stop , thereby also cutting light by half with each stop ) (
IS0 100 , 200 , 400 , 800 , 1600 , 3200 , 6400
( Increasing Sensitivity of Light of Sensor by 2 with each stop )
1) So for example if i have a correct exposure of Ap - 5.6 , SS - 1/60 , ISO 400 and want to get shallower DOP , if i increase Ap by 2 Full Stops to 2.8 , i can either increase Shutter Speed or ISO by 2 stops to maintain exposure or increase each by 1..Correct?
In the same with , if i'm getting correct exposure with the above but want to stop some movement i'm getting, i can increase SS to 1/125 and reduce ISO by 1 stop yes?
2) Whats a good rule of thumb for Shutter Speed value when holding handheld to avoid camera shake and also to Freeze general movements of people interacting in a Family function for example (lets say im using 50mm lens on my T3i crop sensor)
3) Whats a good rule of thumb for ISO limit when shooting in a dark lit location like hotel lounge with dim lights that i will still be able to get photos which are visually usable even when printed on a 4R size(lets say im using 50mm lens on my T3i crop sensor)